The couple and a 29-year-old Gilbert man were arrested in February. In March, the couple pleaded not guilty to charges of planning to have sex with a dog.

County sheriff's deputies said the three suspects drove to a prearranged location intending to commit bestiality with a dog. The owner of the golden shepherd was an undercover detective.

Bestiality is a class 6 felony, sheriff's officials said.

The Walkers posted a Craigslist ad on Feb. 7 titled, "Wife looking for K9," according to Maricopa County Superior Court records.

An undercover animal-crimes detective found the Walkers' alleged ad and began corresponding via e-mail with the couple for more than two weeks. During that time, the detective learned about the couple's plan, court records state.

The wife offered sexual favors to the detective, and the couple agreed to meet at a Quality Inn in Mesa, expecting the detective to bring a dog, court records show.

Shortly before the planned meeting, the detective learned that Robert Aucker, 26, of Gilbert would be joining them to have intercourse with the couple and to watch the bestiality occur, court records show.

The trio was arrested at about 8 p.m. on Feb. 27 at the Quality Inn, court records show.

Court records state that self-employed photographer Sarah Walker admitted to detectives that she told both her husband and Aucker that she wanted a dog to have sex with her.